Oil lamp



FIG. 1 is a right front perspective view of an oil lamp showing the new design;

FIG. 2 is a rear elevational view thereof, the front being a mirror image thereof;

FIG. 3 is a right side elevational view thereof, the left side being a mirror image thereof;

FIG. 4 is a plan view thereof; and,

FIG. 5 is a bottom view thereof. 

The ornamental design for an oil lamp, as shown and described. 